A block weighing (Fg) 35 N is resting on a steel table (µs = 0.40) .
The minimum force to start this block moving is N.
In the vertical direction, the normal force must be equal and opposite to the weight down. Thus:
N = W = 35 N
To start the block moving, a force is needed to overcome the friction.
fs = μs FN
Fmin = 0. 40 × 35 N = 14 N